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신아리(Ari Shin),한준현(Jun Hyun Han) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.3
The effects of surface modification by nitric acid on the pre-treatment of electroless copper plating were investigated. Copper was electroless-plated on the nitric acid treated graphite activated by a two-step pre-treatment process (sensitization + activation). The chemical state and relative quantities of the various surface species were determined by X-ray photoelectron spectroscopy (XPS) after nitric acid modification or pre-treatment. The acid treatment increased the surface roughness of the graphite due to deep and fine pores and introduced the oxygen-containing functional groups (-COOH and O-C=O) on the surface of graphite. In the pre-treatment step, the high roughness and many functional groups on the nitric acid treated graphite promoted the adsorption of Sn and Pd ions, leading to the uniform adsorption of catalyst (Pd<SUP>0</SUP>) for Cu deposition. In the early stage of electroless plating, a lot of tiny copper particles were formed on the whole surface of acid treated graphite and then homogeneous copper film with low variation in thickness was formed after 30 min.
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소양호에 서식하는 쏘가리 Siniperca scherzeri의 성숙과 산란 특성
신아리 ( Ari Shin ),박희원 ( Heewon Park ),이완옥 ( Wan-ok Lee ),송미영 ( Mi-young Song ) 한국어류학회 2018 韓國魚類學會誌 Vol.30 No.2
본 논문은 소양호에 서식하는 내수면어업의 주요 수산자원 중 하나인 쏘가리 (Siniperca scherzeri)의 성숙과 산란에 관하여 연구하였다. 본 논문에 사용된 쏘가리는 2014년 4월부터 11월까지 정치망과 자망을 통해 채집하였고, 암컷이 204개체로 전장범위는 113~365 mm이었고, 수컷은 197개체로 전장 범위가 140~342mm이었다. 산란기가 시작되는 5월의 수온은 15°C를 나타냈으며, 점진적으로 높아져 7월에 26°C를 나타내었다. 암컷의 생식소 숙도지수 (GSI)는 5월에서 7월까지 각각 2.3%, 4.6%, 3.1%로 나타났고, 수컷의 경우 8.0%, 6.6%, 4.5%로 나타났다. 난소 조직은 5월에 많은 수의 샘플이 중숙으로 관찰되었으며 6월에는 대다수가 성숙, 7월에는 완숙 및 방란으로 관찰되었다. 정소 조직의 경우에도 마찬가지로 5월에는 대다수가 중숙, 6월에는 성숙, 7월에는 방중으로 관찰되었다. 월별 성숙도와 생식소 숙도지수 (GSI), 생식소의 조직관찰을 통한 분석결과, 소양호에 서식하는 쏘가리의 산란기는 5월에서 6월로 추정되었다. 또한 군성숙도를 분석한 결과, 암컷 쏘가리의 50% 성숙체장은 245.16mm로 나타났다. The study about maturity and spawning of Korean Mandarin fish, Siniperca scherzeri collected using the set net and gill net in Soyangho Lake from April to November 2014 was conducted. The number of individuals was 401 (female: 204, male: 197). The total length of females ranged from 113 mm to 365 mm and that of males was from 140 mm to 342 mm. The water temperature in May which is the start of spawning season indicated about 15°C and gradually increased to July (26°C). Gonadosomatic index (GSI) of females indicated 2.3%, 4.6% and 3.1%, respectively, in May to July. Males’ value showed the similar pattern recording 8.0%, 6.6% and 4.5% in the same time. According to histological observations of gonadal tissue, the most of female in May had the gonadal tissue of maturing and mature stage. And the ovary of June was mostly in the stage of ripe and spawning and a number of individuals in July was recovery stage. In the case of male, a number of males in May showed in the stage of mature. The testis of June showed that mature sperm was releasing. And the testis of July was mostly in recovery stage. The total length at 50% group maturity was estimated 245.16 mm. As shown in the above, the main spawning period of S. scherzeri was May to June.
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열처리 온도 및 냉각방법이 Cu-22Sn합금의 미세조직 및 경도변화에 미치는 영향
정무섭 ( Museob Jeong ),신아리 ( Ari Shin ),한준현 ( Jun Hyun Han ) 한국열처리공학회 2018 熱處理工學會誌 Vol.31 No.3
The effects of heat treatment time and cooling method on microstructure and mechanical property of Cu-22wt%Sn alloy were discussed. α+δ mixed phase structure was obtained in air-cooled specimens after heat treatment at 775, 750, and 700℃ for 1 hour. On the other hand, in water-cooled specimens, α+β' martensite mixed phase was obtained. In the case of water-cooled specimens, the hardness value decreased with decreasing heat treatment temperature because the volume fraction of α phase with low hardness value increased as the heat treatment temperature decreased. In water-cooled specimen after heat treatment at 600oC, γ' martensite was formed instead of β' martensite. The hardness value of γ' martensite was lower than those of β' and δ phases. (Received April 12, 2018; Revised April 18, 2018; Accepted April 27, 2018)
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